The X-Shutter and ebony grip
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The X-Shutter and ebony grip

This brings us to the new X-Shutter mechanism, shown here protruding between the mount and the lens barrel. Phase One tells us that their experience in industrial applications informed this new unit's construction.

The X-Shutter is electromagnetically controlled, and allows for shutter speeds from 1/1000 sec to 60 minutes, and is tested for a minimum of 500,000 actuations. There are 5 rounded aperture blades, all made of carbon fiber.

Oh, and last but not least, you can get a nice view of the XT's grip in this image. It's made of ebony, and is one of very few non-metal components on the camera.